Petroleum Refinery Engineering

61. Crude oil is subjected to vacuum distillation in the last stage, because

1. High boiling point products like heavy fuel oil & lubricating oils are heat sensitive and may decompose
2. Lighter/low boiling products are prone to thermal decomposition
3. High purity products can be obtained thereby
4. None of these

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62. Crude oil is transported inland from oil field to refineries, mainly by the

1. Road tankers
2. Rail tankers
3. Underground pipelines
4. None of these

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63. Crude oil produced by Indian oil fields are predominantly _________ in nature.

1. Paraffinic
2. Naphthenic
3. Asphaltic
4. Mixed base

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64. Crude oils containing more than _________ kg of total salts (expressed in terms of NaCl) per thousand barrel is called a 'salty crude'.

1. 1
2. 5
3. 15
4. 25

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65. Crude petroleum oil is a _________ fuel.

1. Primary
2. Fossil
3. Both (A) & (B)
4. Secondary

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66. Crude topping column operates at _________ pressure.

1. Atmospheric
2. 10 atm
3. Vacuum
4. 3 atm

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67. Dearomatization of kerosene (by liquid sulphur dioxide extraction) is done to

1. Increase its smoke point
2. Improve its oxidation stability
3. Decrease the breathing loss
4. None of these

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68. Deoiling is the process of removal of oil from wax. It is done by the _________ process.

1. Solvent extraction
2. Sweating
3. Resettling
4. All (A), (B) & (C)

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69. Deoiling of wax is done by its

1. Heating
2. Cooling
3. Solvent extraction
4. Both (B) & (C)

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70. Diesel index (an alternative index for expressing the quality of diesel) is

1. Determined by using a test engine
2. Not related to aniline point
3. Equal to cetane number plus 3
4. All (A), (B) & (C)

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